Starting and idle-running device for jet-carbureters.



SCHUTTLER.

STARTING AND IDLE RUNNING DEVICE FOR JET CARBURETERS.

APPLICATIQN FILED JAN. 16, 1914.

Patented Feb. 1, 1916.

JM/ (AM a i TE m new anion.

PAUL soHiiTTLER, or GHAR OTT NBURG, GERMANY, ASSIGNOR T 1 ALLAs vnnensnn G. M. B. 1-1., on BEARLIN-CHARLOTTEN'BURG, GERMANY STARTING AND iDLE-RUNNING nnvrcnnoli JET-CARBURETERS.

, To all whom it may concern:

Be it known that I, PAULSoHt'i'rTLnR, a subject of the German Emperor, and resident of Kaiser-Friedrichstrasse 7, Charlottenburg, near Berlin, Germany, have invented new and useful Improvements in Starting and Idle-Running Devices for Jet- .Carbureters, of which the following is a specification. v

This invention relates to a carbureter in which the supply of fuel during the starting pf the engine, and while it is running idle, as well as while it is running under a,

load during the normal use, is automatically regulated, and comprises a construction-of 'an atomizer especially adapted for the purpose so that it may perform all these functions, be safe to drive, and be easily put together.

The invention relates. especially to the improvement that has to do with the starting and idle running. The governing, under variations of the load during normal running of the engine, forms the subject of another application, Serial No. 7 32,309, filed November 19, 1912, and reference may be made to the drawing of that application as showing a means for effecting that result.

If the machine is running idle, in general, the throttle valve located inthe carburetor will be closed, so that the machine will draw in very little air and very little fuel. In most carbureters, on account of the slight suction, the usual atomizer will either not work at all, or work so unreliably that the machine cannot be set, for a determined number of revolutions between the position of complete idleness and one of considerable speed. For this purpose there is generally used a special opening for leading the fuel into the carbureter during the starting or idle running of the machine. opening belongs either to a second atomizer or is located in the wall of the carbureter in the vicinity of the throttle pipe. In previous construction the fuel is conducted to these auxiliary openings through channels which are independent of the main atomizer.

Inthis invention .the spraying pipe, in addition to normal exit openings, is provided with supplemental exit openings, which, when the atomizer is located in the wall'of the carbureter, are in communication with a channel in the wall of the chamber, so that discharge of the fuel from these aux- The special ture.

Specification of Letters Patent. Pateted Feb 1, 1916,

Application filed January 16, 1914. Serial No. 812,495.

iliary openings ensues, if suflicient suction occurs in the channel.

I The drawing shows in Figure 1, in cross section, a carbureter made in accordance with my invention, and in Fig. 2, a section through the atomizer. Fig. 3 is an enlarged air tube (Z concentric therewith, at the upper end of which is provided a replaceable nozzle e, which is protected against dust by means of the filter e, The openings 0 in the atomizer 0, discharge into a channel formed between screw'threads on the upper part of the tube 0, which channel, after the tube is placed in position, is in communication with the channel 9 in the wall of the container. The channel 9 leads to the opening f in the wall of the suction channel of the carbureter, at a point which lies near the edge of the closed throttle valve E. Between the channel 9 and the opening f is a replaceable screw h with a channel it. This channel is drilled centerwise through a portion of the screw, and by means of a bend at right-angles leads to a groove 72, in the exterior part of the screw. Said groove is in communication with channel 9. The opening 71, is calibrated to meet the need of the engine. It will be noted that the atomizer is continuous and integral. It will be noted, moreover, that it can be withdrawn in its entirety through opening shown atthe left of Fig. 1 by simply turning the nut. After withdrawal it can be examined and repaired or readjusted, and returned without disturbing any other part of the struc- No part of this tubular atomizer exceedsin diameter the diameter of the screw thread portion.

In the holder a is locatedthe hinged float A, which, in a well known manner, controls an admission valve m. The atomizer tube 0, together. with the air channel d and the regulating nozzles b and '6, may be set altogethe'r in the Wall of the carbureter, or they may be separated therefrom and connected wholly by means of'the screw 0 therewith. The atomizer tube extends in an oblique direction through the suction tube S, and its lower end projects into the holder a. It is provided with a packing in the wall between i .the suction tube and the fuel holder.

The manner in which the atomizer works 'is as follows: In the position of rest the level of the fuel rises as high as the openings 0, or almost as high, and the fuel fills the atomizer tube 0, as Well as the air tube (Z, partly. It is a peculiarity of an atomizer that the. nozzle?) is directly opposite the mouth of the air tube at, so that the fuel entering through the opening 7) has the tendency, on account of its momentum, to flow into the air tube. Since under a sudden load and consequent lowering of pressure, the fluid,

mixture supplied is not so rich. In this case the tube 0 will be entirely emptied of the fueland will serve only to conduct air to the fuel supply inside the atomizer and during the higher number of. revolutions, in increas ing quantity. It works also as a brake in that it dampens the abruptness of variations of thefuel supply. The nozzle 6 serves for controlling the supply of air let in.

In conformity with the invention, inthe atomizer tube' 0 above the openings 0, are the auxiliary openings '0 which," while the motor is running idle, and while it is starting, come into action. The throttle E is located in the "position shown in Fig. 1, and practically closes the suction channel's. At the opening f in the wall of the suction channel there is a restricted passage. suctionthrough here causes. suction in'the channel 9, so that fuel. is drawn into the :space between the automizer tube 0- and the air tube at and is discharged through the openings 0 The suction at the openings 0, because of the small velocity of'the air at this part of the channel, is so small that the exhaust at the opening 0 overcomes it. Air,

. therefore, enters the opening 0' .and forms a mixture with the fuel andthe mixture dis charged from the openings 0 The position .of the throttle valve and the fine adjustment of the opening in thescrew it, make it possible so to regulate the mixture that the device may be adapted to "the running idle of the machine. If the throttle valve is more or less opened the suction in the 'channel gwill be correspondingly weakened or strengthened, and in turn the suction'at the main openings 0 in the suction channel S, correspondingly increased or diminished.

Engine The pull through the openings 0 will cease when the throttle valve is in that position in which the pull through the main injection openings 0 surpasses that through the openings 0 The su'perseding of the auxiliary injection by the normal injection occurs entirely automatically. A further distinction of the discovery is the specially tinuous atomizer extending across the air channel and provided with main discharge openings arranged to discharge into the air channel andalso with auxiliary'discharge openings, and, in the wall of the fuel container, a conduit, discharging into' the air channel, the auxiliary discharge openings of the atomizer being in communication with.

such channel.

2. In combination, in a carbureter, a throttle valve therefor, a continuous atomizer extending across the air-channel and provided with main openings arranged to discharge into the air channel of the carbureter, and

provided also with auxiliary discharge openings, and, 111 the wall of the fuel'contamer a channel arranged 1n commumcation with the auxiliary discharge openings discharging into the air channel of the carbureter at or .near the edge 'of the throttle valve in its closed position, there'being provided a small passageway between the edge of the throttle valve and the wall of. the

air channel.

3. In a carbureter, and 1n combination therewith a continuous atomizer extending across the air-channel and provided with 'main 'jet orifices discharging into the air intake channel, and also provided with auxiliary openings discharging into an auxiliary channel," said auxiliary channel dis- .and an open-ended pipe arranged centerwise of said-atomizer, and COII'IIIlUIHCQtIIIg" freely with said atomizer, said atomizer being provided with an auxiliary discharge opening, communicating with the air intake channel, on the engine Side of the throttle .charging into the intake channel, and an valve, whereby when the throttle is closed suction may come through saidauxiliary openings and air be drawn downward through the air pipe and upward through the channel-discharge openings.

5. In a carbureter, an atomizer provided at its upper part-with two screw threads and a channel between said'Js'crew threads,

I andalso provided with discharge openings,

said atomizer'arranged toextend obliquely across the air intake channel and supported by f said '-.screw threads in the wall of the carburete'r so that its lower end communif-cates with'the fuelichamber, the walls of said carbureter-bein provided with a channel leading from t e atomizer channel to the air intake channel through said open- 6. In a "carbureter and in combination therewith, a continuous channeled atomizer provided with dischargeopenings" and ar- Iranged'to'extend "obliquely across the air intake channel and supported. inthe wall of the carbureter so that its lower end communicates with thefue'l chamber, j and the'WaIl of the carbureter. being provided a' channel communicating with said channel in the atomizer and with the intake channel near the throttle valve. i

7. In a carbureter, in combination, acon,

tinuous tubular atomizer, a screw thread on said atomizer, said atomizer provided with a channel connected at its lowerend with the fuel supply and also connected with the discharge openings, the said atomizer being removable and replaceable" as an entirety without v disturbing other features of the structure.

In testimony, that I vclaim the foregoing as my invention, I have signed my name in -presence of two witnesses, this 5th day of January, 1914.: 1 v

I o PAUIJSCHIITTLER, witnesses: I v WoLDEMAR' HAUPT,

HENRY HASIER." 

